Port was given a whole-life term for the murders of four young men he poisoned with lethal doses of the substance and raped after meeting them on Grindr.

Image copyrightMet Police

Image caption Gerarld Matovu was found guilty of a string of offences, including murder, following a trial

Matovu was also found guilty of six counts of administering a noxious substance so as to endanger life and one of possession of GBL with intent to supply.

His co-defendant Brandon Dunbar, from Forest Gate, east London, was convicted of two counts of administering a noxious substance so as to endanger life, six counts of possessing articles for use in fraud, four of theft, and one of fraud.

The men were also both found guilty of assault by penetration, assault and theft in relation to one victim.